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Chapter 8 - Special Functions
8-6
feature. For most other Caller ID schemes, only the Caller
telephone number is provided.
Distinctive Ring
Distinctive Ring is a phone service that may be offered by your phone company.
Check your phone company for availability. With this service, you can have
several phone numbers assigned to the same phone line. The phone company will
send a different type of ring signal for each phone number being called. The
subscriber can distinguish which number is called by which type of ring is
received.
A simple use of this feature is that you can have three numbers on the same line
and you can list the three numbers for voice, data, and fax, respectively. You can
then have your fax machine answer only the ring corresponding to the fax number
and have your modem answer only the ring corresponding to the data number. The
voice call will not be answered by either fax machine or data modem and it will
only be answered when someone picks up the phone. Or you can have the
answering machine answer only the voice ring. A more complicated use is that
you can have one number for multiple uses, such as one number for both data and
fax.
A ring signal is a composition of repeated on and off states. Different types of
rings usually correspond to different compositions of the “ON” part (cadence) of
the ring. The Omni 288S modem can distinguish up to four types of ring signals
and can be commanded to answer or not answer any one of these four types of
ring signals. Following is a list of these four types of ring signals. These are the
ring types used in the USA. The difference among the ring types is the two-
second ON part of the ring signal. It comprises a long, double short, or triple short
ring.
S-register S40 bits 3-6 are used for distinctive ring control. Each bit controls the
answering of a particular ring type. Setting a bit to “1” (on) enables answering,
setting it to “0” (off) rejects the ring. Note that the ring may still be heard even if
it is not counted as an accepted ring by the modem.
The control relationships between bits 3-6 in register S40 and the different ring
types are:
Type Bit (on) Ring Sequence
1 3 1.2s or 2s on; 4s off
2 4 0.8s on, 0.4s off, 0.8s on; 4s off
3 5 0.4s on, 0.2s off, 0.4s on, 0.2s off, 0.8s on; 4s off
4 6 0.3s on, 0.2s off, 1s on, 0.2s off, 0.3s on; 4s off
Note: If all of these bits are "0" (off), any ring with a duration longer
than 100 ms will be accepted. Use this default if you do not
have distinctive ring service.